everyone has their own opinion as to which engine to use...some say a small block V8 for power ...other,s say a lighter V6 is the way to go in the mud....truthfully...it depend,s on just how you have your truck set up. .4 wheel drive with manual tran,s ...4 wheel with auto tran,s...suspension set up...which tire,s...& so on....personally I'd go with a hopped up small block chevy V8. & a 400 turbo automatic with a good shift kit in it. 4 wheel drive of course..but that,s me...like I said...everyone has their own opinion.....best of luck!